@ValiantGrizzly: Rock is porous, so even if it was sealed, we're talking about a multiple-story vacuum here. There's bound the be a crack or two, not counting any future structural damage that might happen from suddenly creating a giant underground vacuum!

@ValiantGrizzly: Rock is porous, so even if it was sealed, we're talking about a multiple-story vacuum here. There's bound the be a crack or two, not counting any future structural damage that might happen from suddenly creating a giant underground vacuum!

If it was sealed, you wouldn't have been able to shoot a portal at the moon through the giant gaping hole lol

@Enigma777 The atmospheric pressure would attempt to equalize between Earth and the moon, so it depends on whether the moon's gravity could actually hold onto any of that atmosphere. The fact that it's rushing through the portal with considerable velocity would likely mean the moon's minimal gravity wouldn't be enough to slow the gas and it would continue out into space.